Предмет: Геометрия, автор: Vl2089

даны векторы а(-1;2;3) и в(-5;1;0) Какой угол острый, тупой или прямой) между векторами а ив ?

Ответы

Автор ответа: vajny
0

Найдем скалярное призведение векторов а и в.

(ав) = х1х2 + у1у2 + z1z2 = 5 + 2 + 0 = 7  -  больше 0. 

Значит угол между векторами - острый.

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